Hetero-site nucleation for growing twisted bilayer graphene with a wide range of twist angles

Luzhao Sun, Zihao Wang, Yuechen Wang, Liang Zhao, Yanglizhi Li, Buhang Chen, Shenghong Huang (), Shishu Zhang, Wendong Wang, Ding Pei, Hongwei Fang, Shan Zhong, Haiyang Liu, Jincan Zhang, Lianming Tong, Yulin Chen, Zhenyu Li, Mark H. Rümmeli, Kostya S. Novoselov, Hailin Peng (), Li Lin () and Zhongfan Liu ()
Additional contact information
Luzhao Sun: Peking University
Zihao Wang: University of Manchester
Yuechen Wang: Peking University
Liang Zhao: Soochow University
Yanglizhi Li: Peking University
Buhang Chen: Beijing Graphene Institute
Shenghong Huang: University of Science and Technology of China
Shishu Zhang: Peking University
Wendong Wang: University of Manchester
Ding Pei: University of Oxford
Hongwei Fang: ShanghaiTech University
Shan Zhong: Peking University
Haiyang Liu: Peking University
Jincan Zhang: Peking University
Lianming Tong: Peking University
Yulin Chen: University of Oxford
Zhenyu Li: University of Science and Technology of China
Mark H. Rümmeli: Soochow University
Kostya S. Novoselov: University of Manchester
Hailin Peng: Peking University
Li Lin: University of Manchester
Zhongfan Liu: Peking University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Twisted bilayer graphene (tBLG) has recently attracted growing interest due to its unique twist-angle-dependent electronic properties. The preparation of high-quality large-area bilayer graphene with rich rotation angles would be important for the investigation of angle-dependent physics and applications, which, however, is still challenging. Here, we demonstrate a chemical vapor deposition (CVD) approach for growing high-quality tBLG using a hetero-site nucleation strategy, which enables the nucleation of the second layer at a different site from that of the first layer. The fraction of tBLGs in bilayer graphene domains with twist angles ranging from 0° to 30° was found to be improved to 88%, which is significantly higher than those reported previously. The hetero-site nucleation behavior was carefully investigated using an isotope-labeling technique. Furthermore, the clear Moiré patterns and ultrahigh room-temperature carrier mobility of 68,000 cm2 V−1 s−1 confirmed the high crystalline quality of our tBLG. Our study opens an avenue for the controllable growth of tBLGs for both fundamental research and practical applications.

Date: 2021
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DOI: 10.1038/s41467-021-22533-1

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